GE AKR-30 Series Maintenance Manual page 76

13.4.1
ADJUSTMENTS
The only adjustment to be made on the reverse current de­
vice is to make sure that the trip
of 1 /32 in. beyond the point of tripping the breaker. This adjust­
ment should have to be made only when an old device is being
replaced by a new one.
The new device will be factory adjusted so that the top end of
the trip rod (3) will extend 1 /2 in. above the top of the device
case, and no additional adjustments of the trip
quired. To obtain the proper 1 /32 in. overtravel, close the
breaker and proceed as follows:
1 . Loosen the locking nut. (28).
2. Manually lift the trip rod and vary the position of the ad­
justing nut (2A), this establishing
nut where the breaker is just tripped.
NOTE:
Be sure to keep clear of moving breaker parts when
tripping the breakers.
3. With this position of the adjusting nut established, advance
the adjusting nut upward one and one-haH turns.
4.
Tighten the locking nut and the minimum 1 /32-in. over­
travel of the trip rod should be obtained.
1 3.4.2 REPLACEMENT
After removing the wiring for the potential coil the reverse cur­
rent device can be removed and replaced by following the pro­
cedure outlined for replacing the series overcurrent device. See
Section 1 3 .6 . For wiring, see Fig. 1 03 .
1 3.5 SWITCHETTE FEATURE
The switchette is operated by the long-time delay function. Its
purpose is to provide a set of contacts that will close before an
overload occurs. This device will not trip the breaker on over·
load it will trip on instantaneous only.
The switchette feature is available only in
The switchette is used in one pole and EC-1 trips in the other
poles. For the alarm to be effective in indicating the overload
before the other poles trip the breaker, the device must have
less time delay than the other two poles; this is accomplished
by using a lower characteristic on the alarm device than the
other poles or settang the alarm devices long time setting at
80%.
76
rod
has a minimum overtravel
should be re­
rod
the
position of the adjusting
type
EC-1 devices.
1 3.6
TRIP DEVICE REPLACEMENT
Overcurrent devices on AKR30 & AKR50 breakers may bA
the
dismounted by removing
and
the breaker withdrawing the device.
unfastened as shown in Figures 1 04 and 1 05 , and having the
clamps on the case in
the front
of the breaker. You do not have to separate frames on these
breakers.
104
FIG. DISCONNECTING EC COIL
OS
1
FIG. DISCONNECTING EC FRAME
fastening hardware at the rear
EC
devices, after
be
removed, may lowered clear
·
...
beia